A muscled-up Jake Gyllenhaal plays a champion boxer in the latest film from Training Day director Antoine Fuqua.

30 Mar 2015 - 12:42 PM  UPDATED 30 Mar 2015 - 2:56 PM

LOS ANGELES (Variety.com) - The Weinstein Company has released the first trailer for Jake Gyllenhaal's boxing drama "Southpaw," four months ahead of its July 31 release in the U.S. (The Australian release date is August 20.)

The trailer features plenty of boxing action -- starring a muscled-up Gyllenhaal, who added 15 pounds for the role -- set against the backdrop of a family drama stemming from Gyllenhaal's character losing custody of his daughter.

"Southpaw" is directed by Antoine Fuqua from a script by "Sons of Anarchy" creator Kurt Sutter and "The Equalizer" writer Richard Wenk. The story centers on a left-handed champ whose life is sent into a downward spiral by an accident until he receives help from a washed-up former boxer, played by Forest Whitaker.

The project had been in development at DreamWorks starring Eminem before winding up at TWC.

Producers are Todd Black, Jason Blumenthal, Steve Tisch, Alan Riche and Peter Riche. Rachel McAdams, Curtis "50 Cent" Jackson, Rita Ora, Naomie Harris and Victor Ortiz also star.

Watch the trailer below: